2019/11/30 by Waleed Abdallah, Abhass Kumar, Abhijit Kumar Saha · 5 citations
Physics and Astronomy · #Asymmetry #Baryon asymmetry #Cosmology and Gravitation Theories #Leptogenesis #Lepton number #Minimal Supersymmetric Standard Model #Neutrino #Neutrino Physics Research #Particle physics theoretical and experimental studies #Scalar (mathematics) #Supersymmetry #hep-ph
paper · pdf · doi:10.1007/jhep04(2020)065
published in Journal of High Energy Physics 2020(4) (Springer Nature) · 22 pages, 7 figures, version accepted for publication in JHEP
openalex created_date 2019/11/22 · arxiv created 2020/03/27 · openalex publication_date 2020/04/01 · arxiv updated 2020/04/15 · openalex updated_date 2026/08/05
A bstract In this work, we explore soft leptogenesis in the NMSSM framework extended by a right-handed neutrino superfield. We calculate the CP asymmetry, ε , and find it to be non-zero at tree-level without using thermal effects for the final state particles. This is in contrast to soft leptogenesis in the MSSM extended by a right-handed neutrino superfield where thermal effects are essential. The difference arises due to the presence of a 3-body decay of the sneutrino in the NMSSM that violates lepton number at tree-level. Apart from this, we also find that ε ≠ 0 if the additional singlet scalar has a complex vacuum expectation value while all the other NMSSM parameters including the soft SUSY breaking ones relevant for CP asymmetry remain real. We estimate the order of magnitudes of these parameters to produce sufficient baryon asymmetry of the Universe.